It is recorded by Sheikh ‘Aa’id Abdullah al-Qarni that Al Aswad al `Ansi, a man in Yemen who claimed prophethood, asked Abu Muslim to believe in him and testify that he is a messenger. Abu Muslim told him: “I can’t hear a thing.” Al Aswad al `Ansi prepared firewood and threw him in fire. Abu Muslim said: Hasbuna’Llah wa ni`mal wakeel (Allah is sufficient for us and He is the best Protector” – the words that Muslims believe the prophet Ibrahim said when he was thrown in fire), so Allah made the fire cool and safe for him. [wiki 1]